T he nightmare that unravelled the lives of Sally Lane and John Letts started with a single phone call more than 12 years ago. The British-Canadian parents had initially been relieved when their eldest son, Jack , showed a natural proficiency in Arabic. Their introverted teenager, with an apologetic smile, had been struggling with severe Obsessive Compulsive Disorder at school in a quiet middle-class neighbourhood of Oxford. He converted to Islam and asked to spend part of his gap year studying Arabic in Kuwait. Just a few weeks into the course, in August 2014, he called home. “Mum I’m in Syria ,” he said before the crackly line went dead. Jack Letts was an introverted teenager and had been struggling with severe Obsessive Compulsive Disorder at school in Oxford (ITV News) It marked the start of more than a decade of Sally, 63, and John, 65, trying to save their beloved, troubled son and bring him home. A fight that continues today and has left their family in ruins.…